diff --git a/dashboard/env/linux-x86-base/Makefile b/dashboard/env/linux-x86-base/Makefile
index 61ed8a86667..4286d210b5d 100644
--- a/dashboard/env/linux-x86-base/Makefile
+++ b/dashboard/env/linux-x86-base/Makefile
@@ -3,7 +3,7 @@
 # license that can be found in the LICENSE file.
 
 docker: Dockerfile
-	docker build -t gobuilders/linux-x86-base
+	docker build -t gobuilders/linux-x86-base .
 
 docker-linux.base.tar.gz: docker
 	docker save gobuilders/linux-x86-base | gzip | (cd ../../coordinator/buildongce && go run create.go --write_object=go-builder-data/docker-linux.base.tar.gz)
diff --git a/dashboard/env/linux-x86-nacl/Makefile b/dashboard/env/linux-x86-nacl/Makefile
index 355cdf8d98b..738ca806d3d 100644
--- a/dashboard/env/linux-x86-nacl/Makefile
+++ b/dashboard/env/linux-x86-nacl/Makefile
@@ -3,7 +3,7 @@
 # license that can be found in the LICENSE file.
 
 docker: Dockerfile
-	docker build -t gobuilders/linux-x86-nacl
+	docker build -t gobuilders/linux-x86-nacl .
 
 upload: docker
 	docker save gobuilders/linux-x86-nacl | gzip | (cd ../../coordinator/buildongce && go run create.go --write_object=go-builder-data/docker-linux.nacl.tar.gz)